The 1945 Tottenham North by-election was a by-election held for the British House of Commons constituency of Tottenham North in London on 13 December 1945.
The seat had become vacant when the sitting Labour Co-operative Member of Parliament (MP), Robert Morrison had been ennobled on 16 November 1945 as Baron Morrison.
The Labour Co-operative candidate was 53-year-old William Irving.
The Conservative Party candidate was 26-year-old barrister Petre Crowder.
On a much-reduced turnout, Irving held the seat for Labour, with a swing of 8.2% to the Conservatives.